Liliana, Heretical Healer  ^Flip has been my primary deck for over a year now so I hope I can provide some good advice. The biggest question I ask when looking at your deck list is "why are you playing Liliana?" Liliana has two different game plans you can build around. In my build I've chosen to build around Liliana's -2, and have a deck that takes advantage of Waste Not and emptying my opponent's hand. Looking at your build you have next to nothing that synergizes with her -2, leading me to believe your build is the second game plan built around her -X. The issue I see then is looking at your creature base. You're creature curve is insanely expensive. The vast majority of your creatures are going to require you to +2 once or twice before you're going to even have a chance at reanimating them. I'd recommend either cutting some of the higher costed creatures for some lower CMC value creatures or adding some more cards that synergize with Liliana's +2 since you're going to need to use it multiple times throughout the game in order to -X a big target.

Now one hidden and little known gem that's been the MVP of my Liliana deck is Soldevi Adnate. This card is insane value with Liliana, and I can't recommend it enough. At worst you sacrifice it to itself to get your mana back and flip Liliana. At best it eats Kokusho, the Evening Star and you ramp a ton while draining people.

Soldevi Adnate seems pretty nice and is definitely something I may try out. Another sac outlet is always good and the ramp that comes along with it is perfect.

I run Lilana because my curve is expensive. She allows me an early threat regularly. I realize I may not utilize her -x ability optimally, but I have found that I usually draw enough cards or tutor for enough resurrection to take advantage of what I've discarded so I generally go for an emblem. If I can't protect her, the deck has enough value to win on its own.

The deck isn't built 100% around the commander, but it's worked out very well so far. Sweepers help me survive an early onslaught and get me through to the point when my creatures take over the game.